I know Germany has this reputation and Germany can be very efficient at times. But the vast majority of the time Germany is anything but efficient.
The Administration is particularly bad. Most of the time, they're understaffed and digital infrastructure is completely lacking most of the places. Then, in many cases, there is also a ping-pong in terms of responsibilities. Sometimes your stuff is bouncing between different levels of administration (thank you federalism) and sometimes its between different departments. Its not unheard of that you have to provide the same data in different forms for the different departments working for the same agency.
The amount of time I have spend waiting in line to do something as simple as renewing my Perso (national ID) or requesting a passport. When I moved two years ago, I spent 4 hours waiting in line to sign a form stating that I moved here. Waiting for the passport was a similar waiting game (and that is as a German-born citizen, I can't begin to imagine how bad it is when you're also concerned with residency and visa stuff).
German companies love to complain about the bureaucracy of the government, but are effectively replicating that same bureaucracy without any need.
So no, most interactions aren't efficient unfortunately